Purpose– Thepurpose of this paper is to estimate the locational marginal price (LMP) at each distributed generation (DG) bus based on DG unit contribution in loss reduction. This LMP value can be used by distribution company (DISCO) to control private DG owners and operate network optimally in terms of active powerloss. Design/methodology/approach– This paper proposes proportional nucleolus game theory (PNGT) based iterative method to compute LMP at each DG unit. In this algorithm, PNGT ...

Wind energy is one of the emerging sustainable sources of electricity. Wind is intermittent in nature. The typical grid operation of wind energy is complex. The significance of wind energy generation and integration with the grid is increasing day by day. An accurate wind speed forecasting method will help the utility planners and operators to meet the balance of supply and demand by generating wind energy. In this paper, a statistical-based wind speed prediction is implemented without ut...

The five-phase dual-inverter connected to the f ive-phase open-end winding induction motor (FPOEWIM) with a single dc source could result in the flow of common-mode current (CMC) through the common dc bus and motor phase windings. In addition, the FPOEWIM drive contains third harmonic content which do not contribute for torque generation in a distributed wound motor. So, to nullify the CMC as well as the third-harmonic content the sample-averaged zero-sequence current elimination (SA...

A four-level open-end winding induction motor drive (OEWIMD) is realised by feeding the open stator windings of a three-phase induction motor from either end with two-level voltage source inverters (VSIs). These VSIs are operated with unequal DC-link voltages, which are in the ratio of 2:1. This circuit configuration has the disadvantage of overcharging the DC link capacitor of the inverter operated with the lower input voltage. Decoupled space vector pulse-width modulation (DSVPWM) schem...

Partial discharge (PD) source location using acoustic emission (AE) is widely utilized by many trans former manufacturers and power utility engineers in rou tine and critical situation for optimal operation of the electrical power system as well as further risk management and repair planning. The PD detection is not enough to take solution, so identification of PD source is essential to restore apparatus condition. This work aim is to localize the defect geometrically by means o...

Partial discharge (PD) source location in power transformer by measured acoustic signals using bat algorithm is presented. The available literature data considered for this case study is five sensors but for identification of PD source location needs not more than four sensors. Thus, five combinations results are analyzed using bat algorithm. This algorithm is tested on the measured acoustic TDOA signals which were reported in the literature. The results shows that bat algorithm...

This Paper presents a MPPT (maximum power point tracking) design for a Grid connected PV (Photo-voltaic) system using FB-PSO (Forward Backward particle swarm optimization) Technique. The FB-PSO is a new improved method which results in maximum efficiency, fast tracking of maximum power point, less steady state oscillations compare to PO (Perturb and Observe) and CPSO (Conventional PSO) methods. The proposed scheme is examine under PSC (partial shading conditions) and its results...

Relay coordination is important for maintaining proper power system operation and control. Relays should be organized in a special way such that every relay should have a backup and coordination time interval (CTI) between primary and back up and different zones of the relays should be maintained. The relays should operate in minimum desirable time satisfying all the co-ordination constraints optimally. Heuristic techniques are frequently used to get optimal solution of thi...

Relay coordination is an important aspect to maintain proper power system operation and control. Relays should be organized in such a way that every relay should have a backup and Coordination time interval (CTI) between primary and back up and different zones of the relay should be maintained to achieve proper fault identification and fault clearance sequence. The relays should operate in minimum desirable time satisfying all the co-ordination constraints. So, relay coordi...

Wide-Area Measurement System (WAMS) plays a significant role in recovering the historical data for power system post-mortem analysis. For this purpose, the paper presents a new methodology for partitioning a WAM network into number of WAMS regions. It enables restoration process easier. Later, it also suggests a reliable placement of Phasor Data Concentrators (PDCs). For this, transformer equivalent bus constraint, generation-load balance and observability constraints are cons...

Energy harvesting is the scavenging of energy from different energy sources. Vibration energy that is not used in our daily life can be utilized by extracting and conditioning it to a usable form by using piezoelectric material (PZT) is discussed in this paper. Piezoelectric Energy Harvester (PEH) will convert the vibration energy in to electrical energy. Different circuits are used as an interface to condition the PZT output. Full bridge energy harvester (FBEH) and Voltage doub...

—In this paper a Quasi-Z-source based seven level inverter is proposed. The output capacitor of the quasi-Z source network is split into four parts to generate the levels with minimum number of switches. A switch sharing based auxiliary circuit with proportional-integral (PI) controller is used to balance the capacitor voltages. Simulation of the proposed inverter is performed in MATLAB SIMULINK environment for R load and the simulation results show that the auxiliary circuit can bala...

—This paper presents a new structure of Hybrid Quasi Z-source based T-type seven-level inverter for renewable applications. The proposed topology comprises of three quasi Z source based impedance networks cascaded with a T-type seven level inverter structure consisting of H-bridge and bidirectional switches. The bidirectional switches operate at high frequency and are utilized for level generation. Only two switches in the H bridge are utilized for shoot-through insertion, while th...

This paper presents a new Hybrid-bridge asymmetrical transformerless five-level photovoltaic(PV) inverter and also addresses the behavior of common mode voltage(CMV) and their modulation scheme. The proposed inverter topology is derived from the combination of half-bridge and diode-clamped module, which shall be able to produce less variations in the total CMV and suppress the leakage current as per the DIN VDE 0126 1-1 standards. This can be done through an asymmetrical...

This paper presents a single phase five-level cascaded Z-source inverter with reduced number of switches for PV/FC/Wind power applications. The inherent benefits of z source inverter are higher boost gain and fault ride through capability compared with the traditional VSI and CSI inverters. Therefore five-level Z-source converter is simulated in MATLAB/Simulink environment and the generation of control pulses with the help of Xilinx System Generator is presented. A prototype mo...

—In this article, a single-phase Distribution Static Compensator (DSTATCOM) with reduced dc-link voltage is proposed for power quality improvement in a distribution system. Generally, the dc-link voltage of DSTATCOM is maintained twice the peak of Point of Common Coupling (PCC) voltage by voltage regulation loop. But, the dc-link voltage is maintained itself without voltage regulation loop in the proposed method. For this case, the required dc-link voltage magnitude is less when compa...

Three-phase four switch (TPFS) inverters are an effective solution to reduce the size and cost of the distribution STATic COMpensator (DSTATCOM). The performance of TPFS inverter is identical to three-phase four leg, three-phase split capacitor inverter topologies during balanced load conditions. During unbalanced load conditions, the absence of the neutral wire in TPFS topologies does not allow the DSTATCOM to compensate the unbalance in load currents. To overcome this limitation, a spec...

In this study, model predictive control (MPC) of the three-phase split capacitor (TPSC) distribution static compensator (DSTATCOM) using VlseKriterijumska Optimizacija I Kompromisno Resenje (VIKOR) method is proposed. Power quality improvement using MPC involves the selection of switching state which minimises the difference between reference and actual DSTATCOM currents. However, the limitation of MPC is higher switching frequency and limitation of TPSC DSTATCOM is voltage divergence of ...

The prominence of reduced switch count multilevel inverters is rising owing their merits of decreased number of switches and modular structures. There are topologies that use more than one source; however, utilization of all the sources at all levels is seldom. These topologies will diminish the energy effi ciencyoftheconversionsystemasallthesourceswillnotdeliverthe power except at the highest level in the output voltage. These kinds of converters can hamper the penetration of renewabl...